These are bubble tea straws. They're used to drink an Asian green tea / milk drink known as bubble tea. The tea comes with little tapioca balls (the bubbles) and the straws are about twice as large in diameter as American straws. They also tend to be more robust and durable.
Every time I order out Chinese food I have a bubble tea so I have quite a collection. Given their seeming durability I can't help but think they could be useful for something. Maybe jerry rigging some sort of machinery? I can think of some far-fetched ideas such as miniature blow guns or breathing straws for hiding underwater but nothing serious.
Any ideas? Share your uses for other unusual items people wouldn't normally have a use for.